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631861-02-4

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631861-02-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 631861-02-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,1,8,6 and 1 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 631861-02:
(8*6)+(7*3)+(6*1)+(5*8)+(4*6)+(3*1)+(2*0)+(1*2)=144
144 % 10 = 4
So 631861-02-4 is a valid CAS Registry Number.

631861-02-4Relevant articles and documents

Chiral Phosphoric Acid Catalyzed Kinetic Resolution of 2-Amido Benzyl Alcohols: Asymmetric Synthesis of 4H-3,1-Benzoxazines

Rajkumar, Subramani,Tang, Mengyao,Yang, Xiaoyu

, p. 2333 - 2337 (2020)

An efficient method for the asymmetric synthesis of 4H-3,1-benzoxazines was developed by kinetic resolution of 2-amido benzyl alcohols using chiral phosphoric acid catalyzed intramolecular cyclizations. A broad range of benzyl alcohols (both secondary and tertiary alcohols) were kinetically resolved with high selectivities, with an s factor of up to 94. Mechanistic studies were performed to elucidate the mechanism of these reactions, wherein the amide moieties reacted as the electrophiles. Gram-scale reaction and facile transformations of the chiral products demonstrate the potential of this method in asymmetric synthesis of biologically active chiral heterocycles.

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